diff --git a/Gemfile b/Gemfile
index 2f8912a4..e39b383e 100644
--- a/Gemfile
+++ b/Gemfile
@@ -60,6 +60,8 @@ gem 'i18n-active_record',
   require: 'i18n/active_record'
 gem 'font-awesome-rails'
 gem 'email_validator'
+# To display a patched diff for event descriptions
+gem 'differ'
 
 gem 'simple_calendar', github: 'echarp/simple_calendar'
 #gem 'simple_calendar', github: 'excid3/simple_calendar', branch: '1.0'
diff --git a/Gemfile.lock b/Gemfile.lock
index bafefd21..4a10141a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -7,7 +7,7 @@ GIT
 
 GIT
   remote: git://github.com/gregbell/active_admin.git
-  revision: 021843bd48627d19ab63a2f08c6d7f12b62c3714
+  revision: 3d7605f82706c8e107852f44c61ba6d8e9f2100d
   specs:
     activeadmin (1.0.0.pre)
       arbre (~> 1.0)
@@ -91,6 +91,7 @@ GEM
       thread_safe (~> 0.1)
       warden (~> 1.2.3)
     devise-i18n (0.10.3)
+    differ (0.1.2)
     em-websocket (0.5.1)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0.6.0)
@@ -136,9 +137,9 @@ GEM
     hike (1.2.3)
     http_parser.rb (0.6.0)
     i18n (0.6.9)
-    inherited_resources (1.4.1)
+    inherited_resources (1.5.0)
       has_scope (~> 0.6.0.rc)
-      responders (~> 1.0.0.rc)
+      responders (~> 1.0)
     jbuilder (2.0.7)
       activesupport (>= 3.0.0, < 5)
       multi_json (~> 1.2)
@@ -154,7 +155,7 @@ GEM
     kaminari (0.15.1)
       actionpack (>= 3.0.0)
       activesupport (>= 3.0.0)
-    listen (2.7.5)
+    listen (2.7.6)
       celluloid (>= 0.15.2)
       rb-fsevent (>= 0.9.3)
       rb-inotify (>= 0.9)
@@ -214,7 +215,7 @@ GEM
     rdoc (4.1.1)
       json (~> 1.4)
     redcarpet (3.1.2)
-    responders (1.0.0)
+    responders (1.1.0)
       railties (>= 3.2, < 5)
     sass (3.2.19)
     sass-rails (4.0.3)
@@ -245,7 +246,7 @@ GEM
       polyglot (>= 0.3.1)
     turbolinks (2.2.2)
       coffee-rails
-    tzinfo (1.2.0)
+    tzinfo (1.2.1)
       thread_safe (~> 0.1)
     uglifier (2.5.0)
       execjs (>= 0.3.0)
@@ -263,6 +264,7 @@ DEPENDENCIES
   compass-rails
   devise
   devise-i18n
+  differ
   email_validator
   font-awesome-rails
   gritter
diff --git a/app/controllers/moderations_controller.rb b/app/controllers/moderations_controller.rb
index aa93838b..be6ffcd7 100644
--- a/app/controllers/moderations_controller.rb
+++ b/app/controllers/moderations_controller.rb
@@ -1,6 +1,9 @@
+require 'differ'
+
 class ModerationsController < InheritedResources::Base
   before_filter :authenticate_user!
   before_action :set_event, only: [:show, :edit, :update, :destroy]
+  before_filter :set_mailer_host, only: [:update, :destroy]
 
   def index
     @events = Event.unscoped.where moderated: 0
@@ -45,4 +48,9 @@ class ModerationsController < InheritedResources::Base
       params.require(:event)
         .permit :title, :start_time, :end_time, :description, :city, :locality, :url, :contact, :submitter, :tags
     end
+
+    # Useful to manage absolute url in mails
+    def set_mailer_host
+      ActionMailer::Base.default_url_options[:host] = request.host_with_port
+    end
 end
diff --git a/app/mailers/event_mailer.rb b/app/mailers/event_mailer.rb
index 200c11bf..26c6cb81 100644
--- a/app/mailers/event_mailer.rb
+++ b/app/mailers/event_mailer.rb
@@ -1,11 +1,6 @@
 class EventMailer < ActionMailer::Base
   default from: 'moderateurs@agendadulibre.org'
 
-  # Subject can be set in your I18n file at config/locales/en.yml
-  # with the following lookup:
-  #
-  #   en.event_mailer.create.subject
-  #
   def create(event)
     @event = event
     mail to: "to@example.org", subject: t('event_mailer.create.subject', subject: event.title)
diff --git a/app/mailers/moderation_mailer.rb b/app/mailers/moderation_mailer.rb
new file mode 100644
index 00000000..7fab85b1
--- /dev/null
+++ b/app/mailers/moderation_mailer.rb
@@ -0,0 +1,38 @@
+class ModerationMailer < ActionMailer::Base
+  default from: 'moderateurs@agendadulibre.org'
+
+  # Subject can be set in your I18n file at config/locales/en.yml
+  # with the following lookup:
+  #
+  #   en.moderation_mailer.create.subject
+  #
+  def create(event)
+    @event = event
+
+    mail to: "to@example.org", subject: t('moderation_mailer.create.subject', subject: event.title)
+  end
+
+  # Subject can be set in your I18n file at config/locales/en.yml
+  # with the following lookup:
+  #
+  #   en.moderation_mailer.update.subject
+  #
+  def update(event, current_user)
+    @event = event
+    @current_user = current_user
+
+    mail to: "to@example.org", subject: t('moderation_mailer.update.subject', subject: event.title)
+  end
+
+  # Subject can be set in your I18n file at config/locales/en.yml
+  # with the following lookup:
+  #
+  #   en.moderation_mailer.moderate.subject
+  #
+  def moderate(event, current_user)
+    @event = event
+    @current_user = current_user
+
+    mail to: "to@example.org", subject: t('moderation_mailer.moderate.subject', subject: event.title)
+  end
+end
diff --git a/app/models/event.rb b/app/models/event.rb
index 8ce67e1b..fe1552ee 100644
--- a/app/models/event.rb
+++ b/app/models/event.rb
@@ -18,7 +18,7 @@ class Event < ActiveRecord::Base
     .order(:start_time)
   }
   scope :year, -> year {
-    where "end_time >= ? and start_time < ?",
+    where 'end_time >= ? and start_time < ?',
     "#{year}-1-1", "#{year.to_i+1}-1-1"
   }
   scope :month, -> year, month {
diff --git a/app/models/region.rb b/app/models/region.rb
index 04b34c8b..c6371c00 100644
--- a/app/models/region.rb
+++ b/app/models/region.rb
@@ -2,4 +2,8 @@ class Region < ActiveRecord::Base
   has_many :lugs, foreign_key: :region
 
   default_scope { order :name }
+
+  def to_s
+    name
+  end
 end
diff --git a/app/models/user.rb b/app/models/user.rb
index d1e25b2c..33eda7e7 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -29,6 +29,10 @@ class User < ActiveRecord::Base
     encrypted_password == password_digest(password)
   end
 
+  def to_s
+    "#{firstname} #{lastname}"
+  end
+
   protected
     def password_digest(password)
       Digest::MD5.hexdigest password
diff --git a/app/views/event_mailer/create.text.haml b/app/views/event_mailer/create.text.haml
index 3c805e0a..853c7db4 100644
--- a/app/views/event_mailer/create.text.haml
+++ b/app/views/event_mailer/create.text.haml
@@ -1,21 +1,9 @@
 =t '.title'
-
 \
-
 =t '.body', subject: @event.title, start_time: l(@event.start_time, format: :at)
-
-\
-
 = edit_event_url @event, secret: @event.secret
-
 \
-
 =t '.delete_link'
-
-\
-
 = cancel_event_url @event, secret: @event.secret
-
 \
-
 =t '.signature'
diff --git a/app/views/moderation_mailer/create.text.haml b/app/views/moderation_mailer/create.text.haml
new file mode 100644
index 00000000..3f5773bf
--- /dev/null
+++ b/app/views/moderation_mailer/create.text.haml
@@ -0,0 +1,17 @@
+=t '.title'
+\
+=t '.body', subject: @event.title, start_time: l(@event.start_time, format: :at)
+= edit_moderation_url @event
+\
+#{Event.human_attribute_name(:title)}:       #{@event.title}
+#{Event.human_attribute_name(:start_time)}:       #{l @event.start_time, format: :at}
+#{Event.human_attribute_name(:end_time)}:         #{l @event.end_time, format: :at}
+#{Event.human_attribute_name(:region)}:      #{@event.region}
+#{Event.human_attribute_name(:city)}:       #{@event.city}
+#{Event.human_attribute_name(:url)}:         #{@event.url}
+#{Event.human_attribute_name(:contact)}:     #{@event.contact}
+#{Event.human_attribute_name(:submitter)}:  #{@event.submitter}
+#{Event.human_attribute_name(:tags)}:        #{@event.tags}
+#{Event.human_attribute_name(:description)}: #{raw @event.description}
+\
+=t '.signature'
diff --git a/app/views/moderation_mailer/moderate.text.haml b/app/views/moderation_mailer/moderate.text.haml
new file mode 100644
index 00000000..d9230021
--- /dev/null
+++ b/app/views/moderation_mailer/moderate.text.haml
@@ -0,0 +1,7 @@
+=t '.title'
+\
+=t '.body', author: @current_user
+\
+=====================================================
+\
+=t '.signature'
diff --git a/app/views/moderation_mailer/update.text.haml b/app/views/moderation_mailer/update.text.haml
new file mode 100644
index 00000000..30662a98
--- /dev/null
+++ b/app/views/moderation_mailer/update.text.haml
@@ -0,0 +1,13 @@
+=t '.title'
+\
+=t '.body', subject: @event.title, author: @current_user
+
+- Differ.format = :ascii
+= raw Differ.diff(@event.description, @event.description_was).to_s |
+  .gsub(/\[31m/, '') |
+  .gsub(/\[32m/, '') |
+  .gsub(/\[0m/, '') |
+\
+= edit_moderation_url @event
+\
+=t '.signature'
diff --git a/config/locales/fr.yml b/config/locales/fr.yml
index 20643008..80094220 100644
--- a/config/locales/fr.yml
+++ b/config/locales/fr.yml
@@ -191,10 +191,6 @@ fr:
       new:
         title: Identification
         sign_in: Identifier
-  event_mailer:
-    create:
-      title: Nouvel événement
-
   event_mailer:
     create:
       subject: "[Agenda du Libre] Votre évènement: '%{subject}' est en attente de modération"
@@ -205,3 +201,19 @@ fr:
 \n\nPendant la modération et après celle-ci si votre évènement est validé, vous pouvez éditer votre évènement à l'adresse:"
       delete_link: "et vous pouvez l'annuler en utilisant l'adresse:"
       signature: "Merci de votre participation!\n\n-- \nAgenda du Libre"
+  moderation_mailer:
+    create:
+      subject: "[Agenda du Libre] Nouvel évènement à modérer: '%{subject}'"
+      title: Bonjour,
+      body: Un nouvel évènement est à modérer sur
+      signature: "Merci!\n\n-- \nAgenda du Libre"
+    update:
+      subject: "[Agenda du Libre] Édition de l'évènement '%{subject}'"
+      title: Bonjour,
+      body: "L'évènement '%{subject}' a été modifié par\n%{author}\n\nModifications apportées:"
+      signature: "Bonne journée\n\n-- \nL'équipe de modération"
+    moderate:
+      subject: "[Agenda du Libre] Évènement '%{subject}' modéré"
+      title: Bonjour,
+      body: L'évènement a été modéré par %{author}
+      signature: "Merci!\n\n-- \nAgenda du Libre"
diff --git a/test/mailers/moderation_mailer_test.rb b/test/mailers/moderation_mailer_test.rb
new file mode 100644
index 00000000..0459dc46
--- /dev/null
+++ b/test/mailers/moderation_mailer_test.rb
@@ -0,0 +1,28 @@
+require 'test_helper'
+
+class ModerationMailerTest < ActionMailer::TestCase
+  setup do
+    ActionMailer::Base.default_url_options[:host] = 'localhost:3000'
+  end
+
+  test "create" do
+    mail = ModerationMailer.create(Event.last)
+    assert_match(/\[Agenda du Libre\] Nouvel évènement à modérer: .*/, mail.subject)
+    assert_equal ["to@example.org"], mail.to
+    assert_equal ["moderateurs@agendadulibre.org"], mail.from
+  end
+
+  test "update" do
+    mail = ModerationMailer.update(Event.last, User.last)
+    assert_match(/\[Agenda du Libre\] Édition de l'évènement .*/, mail.subject)
+    assert_equal ["to@example.org"], mail.to
+    assert_equal ["moderateurs@agendadulibre.org"], mail.from
+  end
+
+  test "moderate" do
+    mail = ModerationMailer.moderate(Event.last, User.last)
+    assert_match(/\[Agenda du Libre\] Évènement .* modéré/, mail.subject)
+    assert_equal ["to@example.org"], mail.to
+    assert_equal ["moderateurs@agendadulibre.org"], mail.from
+  end
+end
diff --git a/test/mailers/previews/moderation_mailer_preview.rb b/test/mailers/previews/moderation_mailer_preview.rb
new file mode 100644
index 00000000..74ea5d72
--- /dev/null
+++ b/test/mailers/previews/moderation_mailer_preview.rb
@@ -0,0 +1,25 @@
+require 'differ'
+
+# Preview all emails at http://localhost:3000/rails/mailers/moderation_mailer
+class ModerationMailerPreview < ActionMailer::Preview
+  # Preview this email at http://localhost:3000/rails/mailers/moderation_mailer/create
+  def create
+    ActionMailer::Base.default_url_options[:host] = 'localhost:3000'
+    ModerationMailer.create(Event.last)
+  end
+
+  # Preview this email at http://localhost:3000/rails/mailers/moderation_mailer/update
+  def update
+    ActionMailer::Base.default_url_options[:host] = 'localhost:3000'
+    event = Event.last
+    event.description = event.description + '
+hello world'
+    ModerationMailer.update(event, User.last)
+  end
+
+  # Preview this email at http://localhost:3000/rails/mailers/moderation_mailer/moderate
+  def moderate
+    ActionMailer::Base.default_url_options[:host] = 'localhost:3000'
+    ModerationMailer.moderate(Event.last, User.last)
+  end
+end